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@@ -1,113 +0,0 @@
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-<template>
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- <div :class="['nut-backtop', { show: backTop }]" :style="styles" @click="goto">
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- <slot>
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- <div class="nut-backtop-main"></div>
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- </slot>
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- </div>
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-</template>
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-<script>
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-export default {
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- name: 'nut-backtop',
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- props: {
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- distance: {
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- type: Number,
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- default: 200,
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- },
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- bottom: {
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- type: Number,
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- default: 20,
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- },
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- right: {
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- type: Number,
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- default: 10,
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- },
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- duration: {
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- type: Number,
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- default: 1000,
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- },
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- zIndex: {
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- type: Number,
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- default: 1111,
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- },
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- },
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- data() {
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- return {
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- backTop: false,
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- };
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- },
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- mounted() {
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- window.addEventListener('scroll', this.handleScroll, false);
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- window.addEventListener('resize', this.handleScroll, false);
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- },
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- beforeDestroy() {
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- window.removeEventListener('scroll', this.handleScroll, false);
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- window.removeEventListener('resize', this.handleScroll, false);
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- },
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- computed: {
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- styles() {
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- return {
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- bottom: `${this.bottom}px`,
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- right: `${this.right}px`,
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- 'z-index': this.zIndex,
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- };
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- },
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- },
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- methods: {
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- handleScroll() {
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- this.backTop = window.pageYOffset >= this.distance;
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- },
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- goto() {
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- const sTop = document.documentElement.scrollTop || document.body.scrollTop;
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- this.scrollTop(window, sTop, 0, this.duration);
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- this.$emit('click');
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- },
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- scrollTop(el, from = 0, to, duration = 500, endCallback) {
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- this.el = el;
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- let lastTime = 0;
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- let vendors = ['webkit', 'moz'];
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- for (let x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
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- window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
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- window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
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- }
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-
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- if (!window.requestAnimationFrame) {
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- window.requestAnimationFrame = function (callback, element) {
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- let currTime = new Date().getTime();
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- let timeToCall = Math.max(0, 16.7 - (currTime - lastTime));
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- let id = window.setTimeout(function () {
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- callback(currTime + timeToCall);
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- }, timeToCall);
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- lastTime = currTime + timeToCall;
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- return id;
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- };
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- }
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- if (!window.cancelAnimationFrame) {
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- window.cancelAnimationFrame = function (id) {
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- clearTimeout(id);
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- };
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- }
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- const difference = Math.abs(from - to);
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- const step = Math.ceil((difference / duration) * 50);
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-
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- this.scroll(from, to, step, endCallback);
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- },
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- scroll(start, end, step, endCallback) {
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- if (start === end) {
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- endCallback && endCallback();
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- return;
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- }
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-
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- let d = start + step > end ? end : start + step;
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- if (start > end) {
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- d = start - step < end ? end : start - step;
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- }
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- if (this.el === window) {
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- window.scrollTo(d, d);
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- } else {
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- this.el.scrollTop = d;
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- }
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- window.requestAnimationFrame(() => this.scroll(d, end, step));
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- },
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- },
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-};
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-</script>
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